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With that baloney he is really insulting your common sense.
The deep *vertical* lines in your fingernails are genetic. If you have *horizontal* ridges in your nails, you should see a doctor.
Having vertical (longitudinal) ridges on the fingernails refers to the presence of tiny raised lines or ridges that run up and down the length of the nail. Ridges are among the different kinds of nail abnormalities that can develop due to aging, nail injury, or underlying medical conditions.Many people notice an increase in vertical ridges of the fingernails as they age, and this can be a normal development. Aging has been described as the predominant cause of vertical ridges on the fingernails.Onychorrhexis is the medical term used to describe longitudinal ridges on the nails that often accompany brittle nails.
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Most ridges on the fingernails are caused by normal aging and are common. Some ridges though might be an indication of an underlying health problem especially if there is a change in color.
In many cases, changes in the appearance of fingernails can be the first sign of an undiagnosed medical problem such as a circulatory problem, respiratory disorder, iron deficiency anemia, or thyroid disease. Such signs as ridges in the fingernails, discolorations, and changes in the contours of the nail base can be important signs of illness. With that in mind, maybe we should be scrutinizing our fingernails more often! Consult your doctor.
Don't you mean, "how fast do your fingernails grow?"
As far as I know they can be a sign of calcium deficiency. You can also get white lines under the nails which can be caused by this or by damage (banging, trapping fingers etc...).
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On the other hand, horizontal nail ridges may indicate the presence of an underlying illness or medical condition, although this is not always the case. Horizontal nail ridges run from one side of the nail lengthwise across to the other side. One special type of horizontal nail ridge that may indicate underlying illness is called Beau's lines. Beau's lines give horizontal, deeply grooved ridges in the nails which may be slightly darkened in appearance. There are a variety of causes for these distinctive ridges including a previous injury to the nail bed, malnutrition, certain medications, and metabolic disorders such as diabetes. The ridge which characterizes Beau's lines occurs when growth of the nail is temporarily arrested due to an underlying illness, nutritional or metabolic problem. If you have this type of horizontal nail ridge, see your doctor right away.
some nails just get ridges in them. other people get them after being pregnant, others it is a vitamin deficiency. mine how have one due to being sick. i was very sick and had a high temperature. the nail that was developing developed a striation or ridge in it.what you may want to do is go to a nicer salon and ask if the can look at your nails and help you or whether or ask your doctor.folic acid is used to grow nails.Some nail conditions are harmless. These include vertical ridges, which may become more pronounced as you age, and white lines or spots. Spots usually result from injury to the nail plate or nail bed. In time the white spots will grow out.